[mirror_ubuntu-artful-kernel.git] / arch / x86 / include / asm / string_64.h

#ifndef _ASM_X86_STRING_64_H
#define _ASM_X86_STRING_64_H

#ifdef __KERNEL__
#include <linux/jump_label.h>

/* Written 2002 by Andi Kleen */

/* Only used for special circumstances. Stolen from i386/string.h */
static __always_inline void *__inline_memcpy(void *to, const void *from, size_t n)
{
	unsigned long d0, d1, d2;
	asm volatile("rep ; movsl\n\t"
		     "testb $2,%b4\n\t"
		     "je 1f\n\t"
		     "movsw\n"
		     "1:\ttestb $1,%b4\n\t"
		     "je 2f\n\t"
		     "movsb\n"
		     "2:"
		     : "=&c" (d0), "=&D" (d1), "=&S" (d2)
		     : "0" (n / 4), "q" (n), "1" ((long)to), "2" ((long)from)
		     : "memory");
	return to;
}

/* Even with __builtin_ the compiler may decide to use the out of line
   function. */

#define __HAVE_ARCH_MEMCPY 1
extern void *memcpy(void *to, const void *from, size_t len);
extern void *__memcpy(void *to, const void *from, size_t len);

#ifndef CONFIG_KMEMCHECK
#if (__GNUC__ == 4 && __GNUC_MINOR__ < 3) || __GNUC__ < 4
#define memcpy(dst, src, len)					\
({								\
	size_t __len = (len);					\
	void *__ret;						\
	if (__builtin_constant_p(len) && __len >= 64)		\
		__ret = __memcpy((dst), (src), __len);		\
	else							\
		__ret = __builtin_memcpy((dst), (src), __len);	\
	__ret;							\
})
#endif
#else
/*
 * kmemcheck becomes very happy if we use the REP instructions unconditionally,
 * because it means that we know both memory operands in advance.
 */
#define memcpy(dst, src, len) __inline_memcpy((dst), (src), (len))
#endif

#define __HAVE_ARCH_MEMSET
void *memset(void *s, int c, size_t n);
void *__memset(void *s, int c, size_t n);

#define __HAVE_ARCH_MEMMOVE
void *memmove(void *dest, const void *src, size_t count);
void *__memmove(void *dest, const void *src, size_t count);

int memcmp(const void *cs, const void *ct, size_t count);
size_t strlen(const char *s);
char *strcpy(char *dest, const char *src);
char *strcat(char *dest, const char *src);
int strcmp(const char *cs, const char *ct);

#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)

/*
 * For files that not instrumented (e.g. mm/slub.c) we
 * should use not instrumented version of mem* functions.
 */

#undef memcpy
#define memcpy(dst, src, len) __memcpy(dst, src, len)
#define memmove(dst, src, len) __memmove(dst, src, len)
#define memset(s, c, n) __memset(s, c, n)
#endif

DECLARE_STATIC_KEY_FALSE(mcsafe_key);

/**
 * memcpy_mcsafe - copy memory with indication if a machine check happened
 *
 * @dst:	destination address
 * @src:	source address
 * @cnt:	number of bytes to copy
 *
 * Low level memory copy function that catches machine checks
 *
 * Return 0 for success, -EFAULT for fail
 */
int memcpy_mcsafe(void *dst, const void *src, size_t cnt);

#endif /* __KERNEL__ */

#endif /* _ASM_X86_STRING_64_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_STRING_64_H
1965aae3 PA	2	#define _ASM_X86_STRING_64_H
1da177e4 LT	3
1da177e4 LT	4	#ifdef __KERNEL__
3637efb0	5	#include <linux/jump_label.h>
1da177e4	6
953b2f1e	7	/* Written 2002 by Andi Kleen */
1da177e4	8
953b2f1e JP	9	/* Only used for special circumstances. Stolen from i386/string.h */
953b2f1e JP	10	static __always_inline void __inline_memcpy(void to, const void *from, size_t n)
1da177e4	11	{
953b2f1e JP	12	unsigned long d0, d1, d2;
	13	asm volatile("rep ; movsl\n\t"
	14	"testb $2,%b4\n\t"
	15	"je 1f\n\t"
	16	"movsw\n"
	17	"1:\ttestb $1,%b4\n\t"
	18	"je 2f\n\t"
	19	"movsb\n"
	20	"2:"
	21	: "=&c" (d0), "=&D" (d1), "=&S" (d2)
	22	: "0" (n / 4), "q" (n), "1" ((long)to), "2" ((long)from)
	23	: "memory");
	24	return to;
1da177e4 LT	25	}
	26
	27	/* Even with __builtin_ the compiler may decide to use the out of line
	28	function. */
	29
	30	#define __HAVE_ARCH_MEMCPY 1
a75ca545	31	extern void memcpy(void to, const void *from, size_t len);
393f203f AR	32	extern void __memcpy(void to, const void *from, size_t len);
393f203f AR	33
f8561296	34	#ifndef CONFIG_KMEMCHECK
a75ca545	35	#if (__GNUC__ == 4 && __GNUC_MINOR__ < 3) \|\| __GNUC__ < 4
953b2f1e JP	36	#define memcpy(dst, src, len) \
	37	({ \
	38	size_t __len = (len); \
	39	void *__ret; \
	40	if (__builtin_constant_p(len) && __len >= 64) \
	41	__ret = __memcpy((dst), (src), __len); \
	42	else \
	43	__ret = __builtin_memcpy((dst), (src), __len); \
	44	__ret; \
	45	})
aac57f81	46	#endif
f8561296 VN	47	#else
	48	/*
	49	* kmemcheck becomes very happy if we use the REP instructions unconditionally,
	50	* because it means that we know both memory operands in advance.
	51	*/
	52	#define memcpy(dst, src, len) __inline_memcpy((dst), (src), (len))
	53	#endif
1da177e4 LT	54
1da177e4 LT	55	#define __HAVE_ARCH_MEMSET
6edfba1b	56	void memset(void s, int c, size_t n);
393f203f	57	void __memset(void s, int c, size_t n);
1da177e4 LT	58
1da177e4 LT	59	#define __HAVE_ARCH_MEMMOVE
953b2f1e	60	void memmove(void dest, const void *src, size_t count);
393f203f	61	void __memmove(void dest, const void *src, size_t count);
1da177e4	62
953b2f1e JP	63	int memcmp(const void cs, const void ct, size_t count);
	64	size_t strlen(const char *s);
	65	char strcpy(char dest, const char *src);
	66	char strcat(char dest, const char *src);
	67	int strcmp(const char cs, const char ct);
1da177e4	68
393f203f AR	69	#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
	70
	71	/*
	72	* For files that not instrumented (e.g. mm/slub.c) we
	73	* should use not instrumented version of mem* functions.
	74	*/
	75
	76	#undef memcpy
	77	#define memcpy(dst, src, len) __memcpy(dst, src, len)
	78	#define memmove(dst, src, len) __memmove(dst, src, len)
	79	#define memset(s, c, n) __memset(s, c, n)
	80	#endif
	81
3637efb0 TL	82	DECLARE_STATIC_KEY_FALSE(mcsafe_key);
3637efb0 TL	83
92b0729c TL	84	/**
	85	* memcpy_mcsafe - copy memory with indication if a machine check happened
	86	*
	87	* @dst: destination address
	88	* @src: source address
	89	* @cnt: number of bytes to copy
	90	*
	91	* Low level memory copy function that catches machine checks
	92	*
cbf8b5a2	93	* Return 0 for success, -EFAULT for fail
92b0729c	94	*/
cbf8b5a2	95	int memcpy_mcsafe(void dst, const void src, size_t cnt);
92b0729c	96
1da177e4 LT	97	#endif /* __KERNEL__ */
1da177e4 LT	98
1965aae3	99	#endif /* _ASM_X86_STRING_64_H */